In the 10-K it says multiple times that by end of September 2019 all collateralized shares will be due for redemption and returned to the company. I believe the specific date is September 23rd. In the latest Q&A Solomon stated, "One might reasonably regard our outstanding share count as reducible by the number of collateralized shares, not if, but when the loans are repaid or refinanced."
What they did a year and a half ago was reduce the line from $20M to $15M so no more collateral shares had to be issued. It has recently been further reduced to $13M. They specifically stated these collateral shares cannot and have not been sold into the market. (Plenty of other shares were being issued through normal dilution for other payables, that's why the stock was tanking, though it has stopped since the beginning of the year).
I'll just copy and paste some basic info from the latest 10-K that has the info:
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